[https://meego.gitorious.org/meego-developer-tools/bootchart Bootchart] is a handy tool used for profiling the Linux boot sequence, generally used for making your computer boot faster. It consists of the bootchartd daemon, which records and renders a chart of profiling data.

[https://meego.gitorious.org/meego-developer-tools/bootchart Bootchart] is a handy tool used for profiling the Linux boot sequence, generally used for making your computer boot faster. It consists of the bootchartd daemon, which records and renders a chart of profiling data.

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{{Note|Bootchart is now a part of systemd. Please see the [[Systemd#Optimization]] page for more info}}

== Installing Bootchart ==

== Installing Bootchart ==

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=== Boot loader setup ===

=== Boot loader setup ===

This generally involves making a copy of the boot option you want to profile and adding {{Ic|<nowiki>init=/usr/bin/bootchartd</nowiki>}} to it. See [[kernel parameters]] for instructions. When started from the boot loader, bootchart will stop when you get to the login prompt.

This generally involves making a copy of the boot option you want to profile and adding {{Ic|<nowiki>init=/usr/bin/bootchartd</nowiki>}} to it. See [[kernel parameters]] for instructions. When started from the boot loader, bootchart will stop when you get to the login prompt.

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=== rc.sysinit setup ===

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This one is dangerous (you can make your Arch Linux unbootable) - use it only when the first approach fails. When run in this way, not only you'll have to stop bootchartd manually after you boot up (or it will completely fill your harddrive) but it will start with every boot too. Also, any changes to {{ic|/etc/rc.sysinit}} will be reverted next time you update the initscripts package.

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On the positive side, you'll end up with a bootchart that shows what happens after you log in.

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==== Edit /etc/rc.sysinit ====

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Now, we're going to add this line:

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/usr/bin/bootchartd start

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to {{ic|/etc/rc.sysinit}}

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It cannot be too high up, because that would render the system unbootable, but placing it too far into the script will hide anything that happened before from the bootchart.

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It should be safe to put this right before the section that brings up the system clock.

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Look for this line:

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stat_busy "Configuring System Clock"

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Put this:

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/usr/bin/bootchartd start

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before it.

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==== Stop bootchartd after login ====

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As stated previously, you have to stop bootchartd manually.

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Either run this as root:

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/usr/bin/bootchartd stop

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Or with sudo if you have that set up:

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sudo /usr/bin/bootchartd stop

== Generating a chart ==

== Generating a chart ==

Revision as of 05:22, 23 January 2013

zh-CN:BootchartBootchart is a handy tool used for profiling the Linux boot sequence, generally used for making your computer boot faster. It consists of the bootchartd daemon, which records and renders a chart of profiling data.

Installing Bootchart

Note: An alternative to Bootchart is bootchart2. It uses python for generating the final chart instead of a JVM, and only requires: pygtk, git and busybox. See GRUB and GRUB2 configuration bellow

Running Bootchart2

Boot loader setup

This generally involves making a copy of the boot option you want to profile and adding initcall_debug printk.time=y init=/usr/bin/bootchartd to it. See kernel parameters for instructions. When started from the boot loader, bootchart2 will stop after either a default 120 seconds, or when you get to the login prompt (as opposite).

Running Bootchart

To make use of bootchart, you have to either set it as the init process in your boot loader or starting it manually from one of the init scripts (rc.sysinit preferably). Note that if you start bootchartd manually, you have to stop it manually too. In general, be extra careful with this step.

Boot loader setup

This generally involves making a copy of the boot option you want to profile and adding init=/usr/bin/bootchartd to it. See kernel parameters for instructions. When started from the boot loader, bootchart will stop when you get to the login prompt.

Generating a chart

Generating a bootchart involves running:

bootchart-render

in a folder to which you have write access. This will generate a bootchart.png image with your chart.
You'll have to have a Java runtime installed and properly set up before you can do this.

Troubleshooting

It mostly means that bootchartd was unable to detect when the booting process was finished. This can happen when you are using different login manager than KDM or GDM such as SLIM or entrance. You have to open /usr/bin/bootchartd script and append those applications to exit_proc variable, for example:

# The processes we have to wait for
local exit_proc="gdmgreeter gdm-binary kdm_greet kdm slim"

If you are using no login manager, edit the exit_proc variable in this way:

# The processes we have to wait for
local exit_proc="login"

Example bootcharts

Boot in 5 seconds

This article is really awesome and along with a bunch of bootcharts provides some tips on how to boot faster. Some of those improvements are beyond reach of the ordinary user though (patching X.org, kernel, etc.).